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We address a long standing issue and determine the decorrelation efficiencyof the Hybrid Monte Carlo algorithm (HMC), for full QCD with Wilson fermions,with respect to vacuum topology. On the basis of five state-of-the art QCDvacuum field ensembles (with 3000 to 5000 trajectories each andm_pi/m_rho-ratios in the regime >0.56, for two sea quark flavours) we are ableto establish, for the first time, that HMC provides sufficient tunnelingbetween the different topological sectors of QCD. This will have an importantbearing on the prospect to determine, by lattice techniques, the topologicalsusceptibility of the vacuum, and topology sensitive quantities like the spincontent of the proton, or the eta' mass.Comment: 5 pages, 4 eps-figure

Scanning the topological sectors of the QCD vacuum with the hybrid Monte Carlo algorithm